fix: ffi hot fix (#5251)

Description
---
Fixes the build for the `wallet.h` file

How Has This Been Tested?
---
manual 


Breaking Changes
---

- [x] None
- [ ] Requires data directory on base node to be deleted
- [ ] Requires hard fork
- [ ] Other - Please specify

<!-- Does this include a breaking change? If so, include this line as a
footer -->
<!-- BREAKING CHANGE: Description what the user should do, e.g. delete a
database, resync the chain -->

base_layer/wallet_ffi/build.rs

@@ -27,6 +27,7 @@ fn main() {
                 "tari_crypto".to_string(),
                 "tari_p2p".to_string(),
                 "tari_wallet".to_string(),
+                "tari_contacts".to_string(),
             ]),
             ..Default::default()
         },

base_layer/wallet_ffi/wallet.h

@@ -68,6 +68,10 @@ struct CommitmentAndPublicKeySignature_RistrettoPublicKey__RistrettoSecretKey;
 
 struct CompletedTransaction;
 
+struct Contact;
+
+struct ContactsLivenessData;
+
 struct Covenant;
 
 struct EmojiSet;
@@ -298,9 +302,9 @@ typedef struct Covenant TariCovenant;
 
 typedef struct EncryptedValue TariEncryptedValue;
 
-typedef Contact TariContact;
+typedef struct Contact TariContact;
 
-typedef ContactsLivenessData TariContactsLivenessData;
+typedef struct ContactsLivenessData TariContactsLivenessData;
 
 typedef struct CompletedTransaction TariCompletedTransaction;